Publication detail

Doping of alumina ceramics by manganese – Thermodynamical and experimental approach

SVOBODA, J. DRDLÍKOVÁ, K. DRDLÍK, D. KROUPA, A. MICHALIČKA, J. MACA, K.

Original Title

Doping of alumina ceramics by manganese – Thermodynamical and experimental approach

Type

journal article in Web of Science

Language

English

Original Abstract

The preparation of a transparent ultra-fine-grained doped ceramics requires a homogeneous dopant distribution in a matrix. In the present work, two thermodynamical phenomena allowing the preparation of such ceramics (the dissolution of the dopant and the formation of undesirable secondary phases) were experimentally and theoretically studied. A general thermodynamic-kinetic model was developed for dopant dissolution, which was verified for the experimental conditions used in this work. The model and experiment showed that Mn3O4 dopant with overall concentration of 1 at.% and particle size of 50 nm is dissolved and homogenized in a fine-grained alumina matrix within less than one hour at a temperature of 1220 °C. For the purposes of the study of the formation of undesired secondary phase, the phase diagram of the Al2O3-Mn3O4 system was calculated using the CALPHAD approach. Detailed STEM observations combined with EDX and EELS chemical analyses showed that the data used for the calculation of the phase diagram need some modifications because they overestimate the solubility of Mn in the alumina and underestimate the solubility of Mn in the MnAl2O4 spinel.

Keywords

alumina; doping; sintering; electron energy loss spectroscopy (EELS); thermodynamics

Authors

SVOBODA, J.; DRDLÍKOVÁ, K.; DRDLÍK, D.; KROUPA, A.; MICHALIČKA, J.; MACA, K.

Released

27. 3. 2022

Publisher

Faculty of Technology, University of Novi Sad

ISBN

2406-1034

Periodical

Processing and Application of Ceramics

Year of study

16

Number

1

State

Republic of Serbia

Pages from

13

Pages to

21

Pages count

9

URL

http://www.doiserbia.nb.rs/Article.aspx?ID=1820-61312201013S

Full text in the Digital Library

http://hdl.handle.net/11012/204471

BibTex

@article{BUT177570,
  author="Jiří {Svoboda} and Katarina {Drdlíková} and Daniel {Drdlík} and Aleš {Kroupa} and Jan {Michalička} and Karel {Maca}",
  title="Doping of alumina ceramics by manganese – Thermodynamical and experimental approach",
  journal="Processing and Application of Ceramics",
  year="2022",
  volume="16",
  number="1",
  pages="13--21",
  doi="10.2298/PAC2201013S",
  issn="2406-1034",
  url="http://www.doiserbia.nb.rs/Article.aspx?ID=1820-61312201013S"
}